Furnace grate-bar



. 1 UNITED STATES PATENT OFFICE.

.tubular grate bars such as .shown 1n Patent JOHN VAN BRUNT, or NEWYORK, N. Y., AssIGNoR To oOMBusTIoNENeINEr-:RING CORPORATION, or NEWYORK, N.v Y., A CORPORATION OF New lYORK.

FURNAOE GRATE-BR.

, I Specification of Letters Patent:

Application iledJuly 15, 1918. Serial No. 244,861.

To all tolzom t may concern.' Be it known that I, JOHN VAN BRUNT, a

citizen of the United Statesresidin at the city, county, and State ofNew Yor have inventeda certain new and useful Improveement in FurnaceGrate-Bars, of whlch the tion.- My invention relates to improvements ingrate bars and is particularly applicable to @following'is a full,clear, and exact descrip- It has for its-object 'tol produce a grate barin which the evils 4of -the swelling'or blossomin buningo its uppersurface, are reduced.

granted to W. R. Wood, April portions'of the bars.' Thisis donebecause.'-

when'the grate b ars are in use .extreme-heat causesthe upper surfaceofthe iron to burn somewhat and to swell so as to increase the lateraldimensions, and if the upper portions of the bars were closely adjacentto one an- 'other this swelling would cause the" bars to bind so asto-close. the air assages between themand also interfere wlth theirrelative.

movement. With kgrate barsas now constructed, theonly provision made'forguarding against the deleterious effects of such swelling has been thetapering above referred'to.

tion, however, I- make additionalprovision by forming longitudinalgrooves 1n the up`- takes place upon that upper surface can in Vention,

Y part expand into-4 these additional grooves independently of the spaceand ,be taken u left between a jacent bars bythe tapering of the sidesabove referred to.

The following are descriptions of several embodiments of my invention,reference be in Qhad to the accompanying drawings, in wlich,

Figure 1 shows a grate bars from a grate embodying my iii- .shown inFig. 5, and

'Fig. '7' is a transverse section of a twogroove bar havin effect, due-to high heating'or:

ate barsfor stoker furnaces and the like, 1t @has heretofore beencustomary to taper the upper-'portionsof the sides slightly Inaccordance with my inven-44 channeled members 20-20" gether byrivets 21:The parts 20-20 are provided ywith abutments 22v which, when therivets21 are in place, are heldin 'engage-l --the part 20',

plan-view of a pair of Fig. 4 is a' transverse. section of amodiiication in' which a employed; Fig. 5 is` a transverse section of abar plurality of grooves are embodying my invention and having two pperportions in sliding engagement with' .one another;-

lFig.` 6 isa detail of the construction three upper portions', two ofwhich'arein 1d1ng engagement with the t ird.

Referring more particularly to the draw- Patented Fens, 1920.4` e

ings, 1 1 aretwo channeled castings hav- 'ing their upperouter corners 22 beveled, and having their upper inner corners also beveled as at 3 3so as-to form a longitudinal groove down the center of the upper surfaceof 'the bar, These two bars are` held togetherloy rivets 4. The castings`being channeled form a tubular bar suitableto be used in the Stokerdescribed in the Wood Patent No. 818,010 above mentioned.

(as shown in Fi'. 1.v

In thefconstruction-shownin Fig. 4, there are threelongitudinalcastings, 10-10-102, earch of which-has both of its upper edges beveledso as to'form-two grooves 11 between the intermediate casting 102 andtheouter castings 10 and 10 and sothat the outer castings haveexternalslanting surfaces 12. The two castings 10, 10- are channeled soas to form atubular bar and are held together by rivets 1 3; j

Inthe construction shown in Fig. 5 two are held toment with one anotherand Aactto space the parts 20420 apart.' The part 20 has a;- laterallyextending portion 23, which liesbeneath and is engaged by theIunder-surface of a laterally extending portion 24 upon have slantingengaging surfaces, as shown at 25, the engaging surface at 25 on thepart 20 lyingbeneath the surface on the part the .engaging surfacesbeing substantially horizontal. The two parts also In the constructionshown in Fig. 7, three castings 30-30--3O2 are employed, held'togetherby rivets 3l which pass through all three of them. vThesections 30 and `30 vare channeled and provided with abutments 32,

while the section 302 is provided with abut- `ments 32 and divides thelpassageway through the bar. The lsections 3Q and 30 are provided withextensions 33, while the section 302 is provided with extensions 34;, v

which overlap the extensions 33. The lower portions of the sections areprovided with inclined engaging surfaces, as shown at 35, the surfacesupon the member 302 lying beneath the surfaces upon the sections 30-30so that as the sections are all held together, engagement at this pointtends to hold the lower surfaces of the portions 34 against the uppersurfaces of the extensions 33.

In all the forms shown the bars are tubular `and the deleterious effectsof the heat are reduced-by the provision of the longitudinally extendinggrooves formed by the op-v posingbeveled faces in the surfaces of ad#jacent portions of each bar, while in the form shown in Figs. 5 and 7further provision is made for taking up expansion' due to `heat bypermitting the two parts of a bar to move relatively to onek another,vThe sections of the bars" being made of castings and the beveledsurfaces forming the grooves coming at -theedges of these castings, thecomplete bars with their longitudinal grooves can Vbe easily formed'without machining so as to produce a product which 1s inex.

pensive to manufacture and advantages when in use.

yet has decided those skilled inthe As will be evident to' Q art, myinventionapermits various modifica tions l. without departing from thespirit thereof or the scope of the appended claims.

WhatirnI claim is: n A l.- In a stoker grate' a plurality of juxta.

Lasarte? posed tubular grate bars spaced apart from one another at theircentral portionsso as to provide air passages, each grate bar having itsupperouteredges beveled so as to presen/t'surfaces slanting upwardlytoward one another forming flaring mouths for said passages and having alongitudinal groove in its upper surface between said slanting surfaces,permittinggrowth of the tops of the bars in both directions withoutclosing the passage between, adjacent bars.

2. A tubular grate bar comprising two castings having longitudinallyextending sidechannels forming the bore of said tubular bar, eachcasting having its two upper edges beveled so as to present surfacesslanting upwardly toward onef'another, `two of -the surfaces on saidbars forming a longitudinally extending groove between the other twosurfaces.

3. A tubular grate bar comprising a mem-- ber having in one side'thereofa` longitudi nally extending-channel, a member coper.

ating therewith to form the bore of the t-ubu,`

lar bar, the upper pqrtions of said members being spaced apart laterallyso as to form a groove in the uppersurface Vof the bar and be adapted tomove toward one yanother under the effect of variations in heat, saidmembers having adjacent., to their vtop portions upwardly and downwardlyfacing surfaces respectively in engagement with one i another, and meansfor holding said mem`- bers together.

4. A tubular grate bar comprising a member having in one side thereoflongitudinally extending channel, `a member co'- op'erating therewith toform the bore of the tubular bar, the upper portions of said membersbeing spaced apart laterally so 'as to form a groove in the uppersurface of the bar' and be adapted tovmove toward one" anfother underthe effect of variations in heat,

said members having adjacent to their top portions upwardly anddownwardly facing surfaces respectively in engagement with one. another,means for holding said members together, and spacers within the bore ofthe tubular bar, said holding means being` located below said spacers.

'JOHN 'van nnnnr.

